32 results about "Phased array feed" patented technology

The invention discloses a dual frequency band dual polarization spaceborne cloud-rain measurement radar system which is mainly composed of an antenna subsystem, a radio frequency subsystem, a digitalsubsystem, a monitoring subsystem and a power supply subsystem. The antenna subsystem adopts a parabolic reflector/microstrip reflective array antenna feeder system, and comprises a parabolic reflector/microstrip reflective array antenna, a Ka frequency band active phased array feed source, a W frequency band beam waveguide feed system and a Ka/W frequency band shared parabolic reflector/microstrip reflective array antenna. The radio frequency subsystem is connected with the Ka frequency band active phased array feed source, the W frequency band beam waveguide feed system and the digital subsystem. The digital subsystem is connected with a terminal. The system provided by the invention has the advantages that the three-dimensional vertical structure information of clouds and precipitationin the field of view can be quantitatively acquired; and the acquired global cloud-rain three-dimensional structure data can be applied to three-dimensional high-precision inversion of atmospheric clouds and precipitation, can be applied to global extreme weather monitoring and forecasting, and can be applied to atmospheric science and numerical simulation studies.

The invention discloses a dual-polarization broadband weak coupling feed source array and relates to a phase array feed source receiver in the radio astronomy field. The dual-polarization broadband weak coupling feed source array can be used in feed sources of reflector antennasin the field of communication, observing and control and monitoring. According to the distribution rules of a reflector antenna focal plane field, a hexagonal reflection back cavity vibrator is distributed in a hexagonal small-space distribution mode to form a feed source array, so that energy receiving is facilitated, sampling of a focal plane field distribution is met, and good broadband characteristics and weak array coupling can be achieved. The hexagonal reflection back cavity vibrator comprises a radiator, a coaxial feeder, a hexagonal reflection back cavity and a matching disc, wherein the reflection back cavity adopts a small hexagonal structure, and array forming is facilitated.

The invention discloses a miniaturized waveguide power division network, which is composed of at least two one-into-many waveguide power dividers adopting a double-layer waveguide structure. Each one-into-many waveguide power divider includes a first layer of waveguide structure, a second layer of waveguide structure and at least one first-type transition mechanism, and the first-type transition mechanism is provided with a first height transition part and a second height transition part which are in transition connection with the first layer of waveguide structure and the second layer of waveguide structure respectively so that the first layer of waveguide structure and the second layer of waveguide structure are in planes at different heights. The advantages are as follows: because the waveguide power dividers adopting a double-layer waveguide structure are placed alternately, the space is fully utilized, and the volume of the device is reduced; and for a large phased array feed network, a miniaturized waveguide power division network is realized and the demand of the modern phased array technology for a miniaturized feed network is satisfied under the premise of ensuring excellent isolation of the output port and easy integration of the output port with the circuit.

The invention discloses a phased array feed phase control circuit, which comprises a phase controller, N first driving modules, N second driving modules and an N * N array consisting of N * N micro heaters; the phase controller is provided with N first pins and N second pins; the N first pins are electrically connected with one ends of the N first driving modules respectively; the other end of thefirst driving module is electrically connected with one end of each of N micro heaters in one column in the heating array assembly; one end of the second driving module is electrically connected withthe other ends of the N micro heaters in one row in the heating array assembly; and N second pins of the phase controller are electrically connected with the other ends of the N second driving modules respectively. According to the scheme, the N first pins and the N second pins are used for achieving heating control over the N * N array composed of the N * N micro heaters in a grouping control mode, the occupied space of the pins corresponding to multiple light paths is reduced, and the scale of an optical phased array chip can be increased.

The invention provides a flat-panel passive phased array feed network cable source. The flat-panel passive phased array feed network cable source comprises a power splitter, one or more polarization transformers, a power synthesizer and a flat panel waveguide, which are connected in sequence, wherein each polarization transformer comprises an input end waveguide and an output end waveguide, whichare connected through a cavity. According to the flat-panel passive phased array feed network cable source, the waveguide polarization transformers do not need a rotating device and the structure is compact, so that the length of the transformers can be extremely reduced and the cable source is suitable for standard machining; the structure of the cable source becomes compact; signal leakage is reduced and the bandwidth is improved; the echo loss is better than 20d, and a complete feed signal can be provided for a flat-panel passive phased array antenna.

The invention provides a digital back-end device of a phased array feed source receiver and the phased array feed source receiver, and the digital back-end device of the phased array feed source receiver comprises a data transmission module, a digital signal preprocessing module, a data storage module and a beam forming network module, wherein the digital signal preprocessing module comprises a programmable logic gate array integrated with a plurality of multi-channel analog-digital converters, each multi-channel analog-digital converter is used for converting multi-channel analog data in parallel to obtain multi-channel digital data, and the programmable logic gate array is used for performing channelization processing on the multi-channel digital data, and sending data after channelization processing to the data transmission module; and the beam forming network module is used for performing calibration or beam forming according to the channelized data. According to the equipment, thehardware cost can be reduced, two working modes of offline beam forming and real-time beam forming can be realized, and system storage resources can be efficiently utilized.

The invention aims to provide a planar luneberg lens antenna based on thin cloth phased array feed, and belongs to the technical field of antennas. According to the antenna, a spherical luneberg lens antenna is compressed into a plane structure through optical transformation, and then a large-spacing thin cloth feed array matched with the plane lens structure is optimized by using an optimization algorithm, so that after the sparse layout of the antenna is determined, the excitation amplitude of the antenna at different scanning angles in the working process is not changed, and the antenna stability is improved. The EIRP index in the scanning range is ensured; meanwhile, the antenna also has the advantages of high gain, low profile and low cost, and has relatively high engineering practicability.

The invention provides a signal acquisition and processing system. The system is used for collecting and processing multiple paths of array element signals received by a phased array feed source. Thesystem comprises: a signal acquisition and preprocessing unit comprising a first preset number of nodes, each node acquiring a preset number of array element signals, preprocessing the array element signals, dividing the preprocessed array element signals into a second preset number of narrowband signals of different frequency bands, and outputting the second preset number of narrowband signals; acorrelation and beam forming unit which comprises a third preset number of nodes, wherein each node synthesizes the narrowband signals of the fixed frequency band in the first preset number of nodesinto a fourth preset number of beams; and a multi-beam astronomical processing unit which is used for analyzing and storing the beams.

The invention discloses a time modulation phased array feed network chip, which comprises: a numerical control attenuator module 101 used for realizing time amplitude modulation and eliminating inconsistency of each chip caused by a process; a 0/90-degree phase shifter module 103 used for acting together with a Wilkinson power divider WKD2 of a reconfigurable power divider module to form an I/Q orthogonal path so as to realize an orthogonal time modulation phased array system; a 0/180-degree phase shifter module 104 controlled by a FPGA control circuit so as to realize time phase modulation; and an amplifier module 105 consisting of a power amplifier and a low-noise amplifier and used for amplifying a transmitted or received radio frequency signal so as to meet the power requirements of the system on a transmitted signal and a received signal, wherein all the modules are integrated in a single gallium nitride-based time modulation phased array feed network chip. The invention also provides a time modulation radio frequency system. According to the invention, the size of the time modulation radio frequency system can be effectively reduced, the phase shift precision is improved, and the system has higher linearity.

The invention relates to a novel low-cost phased array feed network, which comprises an antenna unit, a phase shifter and an array feed network, the array feed network is composed of five single-layer C-BFNs, each single-layer C-BFN comprises two input ports and three output ports, two of the single-layer C-BFNs serve as input layers of the array feed network, and the remaining three single-layer C-BFNs serve as output layers; three output ports of each single-layer C-BFN in the input layer are respectively connected with one input port of the three single-layer C-BFNs in the input layer; the output ends on the two sides of each single-layer C-BFN in the input layer are connected with one antenna unit through a one-digit (0 degree/180 degree) phase shifter. According to the invention, through cascade connection of a plurality of feed networks, beam control of the four input ports on a 3 * 3 array is realized. Finally, the use number of the T/R assemblies is reduced from nine to four, and the scanning angle of the array antenna is widened.

The invention belongs to the technical field of antennas, and particularly relates to an ultra-wideband phased array feed source with a gradually changing period. A main body of the ultra-wideband phased array feed source is a Vivaldi array antenna, and the ultra-wideband phased array feed source is formed by arranging two Vivaldi antenna units with different unit widths and different bandwidths in a certain mode. The feed source arrangement reduces the number of units to the maximum extent, and the cost is reduced. Due to the ultra-wideband characteristic of the Vivaldi antenna array, the feed source can realize ultra-wideband work. The feed source adopts a dense array to sample a focal plane field so that the reflector antenna can realize higher aperture efficiency. The feed source can be used for a single-reflector antenna system or a double-reflector antenna system, and ultra-wideband high-efficiency work of the reflector antenna is achieved.

The invention discloses a circularly polarized spaceborne antenna based on a 3dB bridge and a spaceborne phased array. A first metal patch is arranged between a feed layer and a dielectric layer; the feed layer is provided with a 3dB coupling bridge, the output end of the 3dB coupling bridge is connected with the first metal patch, and the 3dB coupling bridge is used for circularly polarizing an input signal and transmitting the circularly polarized signal to the dielectric layer; the dielectric layer is used for widening the bit width of the circularly polarized signal and radiating the widened circularly polarized signal outwards; the beneficial effects of the invention are that in the required working frequency band, the axial ratio is lower than 3dB, the standing wave is lower than 1.5, the beam width at the working frequency point is greater than 90 degrees, and the low profile is satisfied; circular polarization is realized in a forced feed mode, and the double-feed mode enables the circular polarization bandwidth to be broadened greatly compared with a common single-feed mode. The radiation leakage of the back surface is reduced, and the normal gain of the antenna and the gain during large scanning angle scanning are improved.

The invention discloses a GEO SAR satellite imaging method based on a single-reflector antenna, belongs to the field of overall design of high-orbit microwave imaging satellites, and aims to perform beam design on GEO SAR of a phased array feed source single-reflector antenna without attitude adjustment and cover all incident angle ranges only through distance-direction electric scanning. In orderto achieve the purpose, the technical scheme of the invention comprises the following steps: S1, selecting an antenna aperture according to the requirements of the minimum unambiguous area and resolution of the antenna, and selecting an antenna focal length according to the antenna aperture; s2, according to an incident angle requirement, calculating a lower visual angle range to obtain a scanning range required to be reached by the antenna, wherein the corresponding relation between the SAR downward viewing angle and the incident angle is shown in the specification, theta is the incident angle, alpha is the downward viewing angle, H is the orbit height and Re earth radius; and S3, setting an antenna feed source to form a scanning range required to be reached by the antenna, and performing satellite imaging.

The invention discloses an optimal design method of a phased array feed source based on focal plane field sampling of a reflector antenna, relates to a high-performance multi-beam antenna technology in the fields of communication, measurement and control, radio astronomy and the like, and aims to provide a phased array feed source design method which is high in efficiency, low in channel number and high in cost performance. According to the method, the characteristics of the focal plane field of the reflector antenna at different focal diameter ratios and different scanning angles are analyzed, the parameter selection principle of the phased array feed source during optimal sampling of the focal plane field is studied, the relation between the antenna aperture efficiency and the PAF design parameters is summarized, a relation curve of the optimal unit spacing of the phased array feed source and the focal diameter ratio is given, and the accuracy of the phased array feed source is improved. A calculation formula of the number of PAF units is exported, a PAF design example and performance analysis are given, and the effectiveness of the design method is verified. The method is suitable for the design of feed sources in the fields of radio astronomy, satellite communication, deep space exploration and the like.

Systems and methods are provided for phased array passband calibration, which permits repeated calibration of the antenna system in the field without a moving far field sensor. An example includes anequalization filter coupled to a phased array feed; a calibration probe disposed to couple with an antenna array to transfer radio frequency (RF) energy; a database of probe-to-far-field (FF) transforms having a probe-to-FF transform for each of a plurality of incidence angles; a calibration component operable to: receive calibration probe measurements for a plurality of frequencies; and determinea calculated phased array passband response for at least a first incidence angle, based at least on the calibration probe measurements and a probe-to-FF transform for the first incidence angle; and afilter generation component operable to generate a tuning configuration for the equalization filter, based at least on the calculated phased array passband response.